[PATCH AUTOSEL 6.14 547/642] vxlan: Annotate FDB data races

Sasha Levin
2025-05-05T22:36:21Z

From: Ido Schimmel <idosch@nvidia.com>

[ Upstream commit f6205f8215f12a96518ac9469ff76294ae7bd612 ]

The 'used' and 'updated' fields in the FDB entry structure can be
accessed concurrently by multiple threads, leading to reports such as
[1]. Can be reproduced using [2].

Suppress these reports by annotating these accesses using
READ_ONCE() / WRITE_ONCE().

[1]
BUG: KCSAN: data-race in vxlan_xmit / vxlan_xmit

write to 0xffff942604d263a8 of 8 bytes by task 286 on cpu 0:
vxlan_xmit+0xb29/0x2380
dev_hard_start_xmit+0x84/0x2f0
__dev_queue_xmit+0x45a/0x1650
packet_xmit+0x100/0x150
packet_sendmsg+0x2114/0x2ac0
__sys_sendto+0x318/0x330
__x64_sys_sendto+0x76/0x90
x64_sys_call+0x14e8/0x1c00
do_syscall_64+0x9e/0x1a0
entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff942604d263a8 of 8 bytes by task 287 on cpu 2:
vxlan_xmit+0xadf/0x2380
dev_hard_start_xmit+0x84/0x2f0
__dev_queue_xmit+0x45a/0x1650
packet_xmit+0x100/0x150
packet_sendmsg+0x2114/0x2ac0
__sys_sendto+0x318/0x330
__x64_sys_sendto+0x76/0x90
x64_sys_call+0x14e8/0x1c00
do_syscall_64+0x9e/0x1a0
entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000fffbac6e -> 0x00000000fffbac6f

Reported by Kernel Concurrency Sanitizer on:
CPU: 2 UID: 0 PID: 287 Comm: mausezahn Not tainted 6.13.0-rc7-01544-gb4b270f11a02 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-3.fc41 04/01/2014

[2]
#!/bin/bash

set +H
echo whitelist > /sys/kernel/debug/kcsan
echo !vxlan_xmit > /sys/kernel/debug/kcsan

ip link add name vx0 up type vxlan id 10010 dstport 4789 local 192.0.2.1
bridge fdb add 00:11:22:33:44:55 dev vx0 self static dst 198.51.100.1
taskset -c 0 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &
taskset -c 2 mausezahn vx0 -a own -b 00:11:22:33:44:55 -c 0 -q &

Reviewed-by: Petr Machata <petrm@nvidia.com>
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
Link: https://patch.msgid.link/20250204145549.1216254-2-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/vxlan/vxlan_core.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/vxlan/vxlan_core.c b/drivers/net/vxlan/vxlan_core.c
index ae0e2edfde1aa..cdd2a78badf55 100644
--- a/drivers/net/vxlan/vxlan_core.c
+++ b/drivers/net/vxlan/vxlan_core.c
@@ -227,9 +227,9 @@ static int vxlan_fdb_info(struct sk_buff *skb, struct vxlan_dev *vxlan,
be32_to_cpu(fdb->vni)))
goto nla_put_failure;

- ci.ndm_used = jiffies_to_clock_t(now - fdb->used);
+ ci.ndm_used = jiffies_to_clock_t(now - READ_ONCE(fdb->used));
ci.ndm_confirmed = 0;
- ci.ndm_updated = jiffies_to_clock_t(now - fdb->updated);
+ ci.ndm_updated = jiffies_to_clock_t(now - READ_ONCE(fdb->updated));
ci.ndm_refcnt = 0;

if (nla_put(skb, NDA_CACHEINFO, sizeof(ci), &ci))
@@ -434,8 +434,8 @@ static struct vxlan_fdb *vxlan_find_mac(struct vxlan_dev *vxlan,
struct vxlan_fdb *f;

f = __vxlan_find_mac(vxlan, mac, vni);
- if (f && f->used != jiffies)
- f->used = jiffies;
+ if (f && READ_ONCE(f->used) != jiffies)
+ WRITE_ONCE(f->used, jiffies);

return f;
}
@@ -1009,12 +1009,12 @@ static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
!(f->flags & NTF_VXLAN_ADDED_BY_USER)) {
if (f->state != state) {
f->state = state;
- f->updated = jiffies;
+ WRITE_ONCE(f->updated, jiffies);
notify = 1;
}
if (f->flags != fdb_flags) {
f->flags = fdb_flags;
- f->updated = jiffies;
+ WRITE_ONCE(f->updated, jiffies);
notify = 1;
}
}
@@ -1048,7 +1048,7 @@ static int vxlan_fdb_update_existing(struct vxlan_dev *vxlan,
}

if (ndm_flags & NTF_USE)
- f->used = jiffies;
+ WRITE_ONCE(f->used, jiffies);

if (notify) {
if (rd == NULL)
@@ -1481,7 +1481,7 @@ static enum skb_drop_reason vxlan_snoop(struct net_device *dev,
src_mac, &rdst->remote_ip.sa, &src_ip->sa);

rdst->remote_ip = *src_ip;
- f->updated = jiffies;
+ WRITE_ONCE(f->updated, jiffies);
vxlan_fdb_notify(vxlan, f, rdst, RTM_NEWNEIGH, true, NULL);
} else {
u32 hash_index = fdb_head_index(vxlan, src_mac, vni);
@@ -2852,7 +2852,7 @@ static void vxlan_cleanup(struct timer_list *t)
if (f->flags & NTF_EXT_LEARNED)
continue;

- timeout = f->used + vxlan->cfg.age_interval * HZ;
+ timeout = READ_ONCE(f->used) + vxlan->cfg.age_interval * HZ;
if (time_before_eq(timeout, jiffies)) {
netdev_dbg(vxlan->dev,
"garbage collect %pM\n",
--
2.39.5